US20150000996A1 - Cab for work vehicle and work vehicle - Google Patents
Cab for work vehicle and work vehicle Download PDFInfo
- Publication number
- US20150000996A1 US20150000996A1 US13/700,003 US201213700003A US2015000996A1 US 20150000996 A1 US20150000996 A1 US 20150000996A1 US 201213700003 A US201213700003 A US 201213700003A US 2015000996 A1 US2015000996 A1 US 2015000996A1
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- US
- United States
- Prior art keywords
- cab
- space
- opening
- hollow space
- work vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D33/00—Superstructures for load-carrying vehicles
- B62D33/06—Drivers' cabs
- B62D33/0617—Drivers' cabs for tractors or off-the-road vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
- B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
- E02F9/0866—Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/16—Cabins, platforms, or the like, for drivers
- E02F9/163—Structures to protect drivers, e.g. cabins, doors for cabins; Falling object protection structure [FOPS]; Roll over protection structure [ROPS]
Definitions
- the present invention relates to a cab for work vehicle and a work vehicle.
- an air pressure in an operator's compartment (a cab) (an internal pressure) of such a work vehicle as a bulldozer has been made higher than an air pressure outside the cab (an external pressure) by blowing air from an air-conditioner.
- a technique for thus preventing penetration of dust particle or noise from the outside by improving hermeticity in the cab is disclosed, for example, in Japanese Patent Laying-Open No. 2001-81811 (PTL 1).
- a cab is formed by fitting a floor frame to a cab main body having an opening in a bottom portion and a gap between the cab main body and the floor frame is sealed.
- a sealing member is either interposed between upper and lower joint surfaces of a mount portion on a cab main body side and the floor frame or arranged between an outer peripheral portion of the floor frame and an inner peripheral portion on the cab main body side opposed thereto.
- a differential pressure between an internal pressure and an external pressure may exceed a threshold value beyond which an operator in the cab feels uncomfortable.
- the present invention was made in view of the problem above, and an object thereof is to provide a cab for work vehicle and a work vehicle capable of preventing dust, water, or the like from entering the cab and realizing an environment in the cab comfortable for an operator.
- a cab for work vehicle includes a floor frame and a plurality of pillars.
- the plurality of pillars are erected on the floor frame.
- At least one pillar of the plurality of pillars has a pipe structure having a first hollow space.
- a first opening for connecting the first hollow space to an outdoor space outside an indoor space surrounded by the plurality of pillars and a second opening for connecting the first hollow space to the indoor space are formed.
- the first opening and the second opening are arranged at a prescribed distance from each other in a longitudinal direction of the pillar.
- air in the indoor space in the cab can be exhausted to the outdoor space through the first hollow space in the pillar. Therefore, a differential pressure between an internal pressure and an external pressure in the cab can be suppressed to be lower than a threshold value and an environment in the cab comfortable for an operator can be realized.
- first opening for connection to the outdoor space and the second opening for connection to the indoor space are arranged at a prescribed distance from each other in the longitudinal direction of the pillar. Therefore, penetration of dust, water, or the like from the outdoor space into the indoor space can be prevented.
- first opening may be connected to the outdoor space by directly opening into the outdoor space, or it may be connected to the outdoor space indirectly through other spaces, other holes, or the like.
- the first opening should only be connected to the outdoor space such that the function and effect above can be achieved.
- the plurality of pillars include a front pillar, a center pillar, and a rear pillar sequentially arranged from front to rear of the cab.
- the center pillar has the pipe structure having the first hollow space and has an upper end opening through which the first hollow space opens at an upper end of the center pillar and a lower end opening through which the first hollow space opens at a lower end of the center pillar.
- the lower end opening is the first opening and the upper end opening is the second opening.
- the first opening and the second opening can be arranged at a prescribed distance from each other in the longitudinal direction of the center pillar.
- the first opening for connection to the outdoor space is the lower end opening of the center pillar and it opens downward. Therefore, as compared with the case where an opening opens upward into the outdoor space, dust, water, or the like is less likely to enter the indoor space through the first opening.
- the cab for work vehicle above further includes a cab structure member other than the plurality of pillars.
- the cab structure member has a second hollow space partitioned off the indoor space and a third opening for connecting the second hollow space to the indoor space.
- the second hollow space is constructed to be connected to the outdoor space through the first opening.
- the floor frame has a double-walled floor board structure constituted of a lower floor board and an upper floor board arranged at a distance from each other, and a third hollow space lying between the lower floor board and the upper floor board is constructed to be connected to the outdoor space through the first opening.
- a work vehicle includes a vehicle frame, any cab for work vehicle described above, an engine, and an engine cooling module.
- the vehicle frame has a front end and a rear end.
- the cab for work vehicle is mounted on the vehicle frame, between the front end and the rear end of the vehicle frame.
- the engine is attached to the vehicle frame on a side of the front end relative to the cab for work vehicle.
- the engine cooling module serves for cooling the engine and it is attached to the vehicle frame at the rear end.
- the cab for work vehicle has a projection portion projecting outward from the vehicle frame in a top plan view and an outdoor-side opening communicating with the first opening in a lower surface of the projection portion.
- the work vehicle according to the present invention has the outdoor-side opening communicating with the first opening in the lower surface of the projection portion projecting outward from the vehicle frame. Therefore, air in the indoor space in the cab is prevented from being suctioned and exhausted to the outdoor space by induced draft caused by a fan in the cooling module.
- an air-conditioner can provide an appropriate pressure to the indoor space in the cab. Therefore, since dust particle or the like can be prevented from entering the indoor space in the cab through the outdoor-side opening, a desired differential pressure can be ensured in the indoor space in the cab and comfort for an operator is improved.
- the outdoor-side opening includes a plurality of openings separate from one another.
- the total opening area of the plurality of openings can be made equal to an opening area of one opening, and a size of each one opening can be made smaller, large dust particle can also be prevented from entering the indoor space in the cab.
- dust, water, or the like can be prevented from entering a cab and an environment in the cab comfortable for an operator can be realized.
- FIG. 1 is a side view schematically showing a construction of a work vehicle in one embodiment of the present invention.
- FIG. 2 is an exploded perspective view schematically showing the construction of the work vehicle in one embodiment of the present invention.
- FIG. 3 is a perspective view schematically showing from below a construction of a cab for work vehicle in one embodiment of the present invention.
- FIG. 4 is a perspective view schematically showing from above the construction of the cab for work vehicle in one embodiment of the present invention.
- FIG. 5 is a perspective view schematically showing from below a construction of an upper portion of the cab for work vehicle in one embodiment of the present invention.
- FIG. 6 is a perspective view schematically showing from above a construction of a lower portion of the cab for work vehicle in one embodiment of the present invention.
- FIG. 7 is a diagram of the cab for work vehicle in one embodiment of the present invention when viewed in a direction of an arrow VII in FIG. 6 .
- FIG. 8 is a schematic perspective view showing a portion around an upper end portion of a center pillar of the cab for work vehicle in one embodiment of the present invention.
- FIG. 9 is a schematic cross-sectional view along the line IX-IX in FIG. 7 .
- FIG. 10 is a schematic cross-sectional view along the line X-X in FIG. 7 .
- FIG. 11 is a schematic cross-sectional view along the line XI-XI in FIG. 7 .
- FIG. 12 is a schematic perspective view showing an exhaust path in each of a pillar and a cab structure member (on the right side).
- FIG. 13 is a schematic perspective view showing an exhaust path in each of a pillar and a cab structure member (on the left side).
- FIG. 14 is a schematic cross-sectional view along the line XIV-XIV in FIG. 9 .
- FIG. 15 is a top plan view for illustrating flow of air in a vehicle frame of the work vehicle in one embodiment of the present invention.
- FIG. 16 is a perspective view from below, for illustrating a cab of the work vehicle in one embodiment of the present invention having a portion projecting from the vehicle frame.
- FIG. 17 is a cross-sectional view for illustrating an arrangement position of an opening which opens into an indoor space and an opening which opens into an outdoor space, both of which are provided in the pillar.
- FIG. 18 is an enlarged view of a portion corresponding to a region R in FIG. 3 , showing a construction where a plurality of through holes are provided directly under a hollow space in the center pillar.
- a bulldozer 30 which is a work vehicle in the present embodiment mainly has a cab 1 , a vehicle frame 31 , an engine 32 , an engine cooling module 33 , a nose portion module 34 , a hydraulic oil tank module 35 , a fuel tank module 36 , a pair of track frame modules 37 , and a dozing blade 38 .
- Cab 1 is a shelter for accommodating an operator's platform.
- Vehicle frame 31 has a front end and a rear end.
- Cab 1 is mounted on vehicle frame 31 , between the front end and the rear end of vehicle frame 31 .
- An operator's seat, an instrument panel, a steering mechanism, and the like are attached to this cab 1 .
- Engine 32 is attached to vehicle frame 31 on a front end side of vehicle frame 31 relative to cab 1 .
- Nose portion module 34 covers engine 32 and an engine compartment.
- Cab 1 is arranged in the rear of engine 32 and the engine compartment covered with nose portion module 34 .
- Hydraulic oil tank module 35 serves to store hydraulic oil for actuating a work implement such as dozing blade 38 of bulldozer 30 and it is arranged on one side of cab 1 .
- Fuel tank module 36 serves to store fuel to be supplied to engine 32 and it is arranged on the other side of cab 1 .
- Cooling module 33 serves to cool engine 32 and the like and it is attached to vehicle frame 31 at the rear end of vehicle frame 31 .
- Cooling module 33 can include a radiator body portion including a charged air cooling (CAC) apparatus, a hydraulic oil cooling apparatus, an engine cooling water cooling apparatus, and a cooling fan.
- CAC charged air cooling
- the bulldozer in which cooling module 33 is arranged at the rear end of vehicle frame 31 as described above is better in front viewability as a vehicle than a general bulldozer in which a cooling module is arranged on a front side of a vehicle frame. This is because a bulldozer with such arrangement can have a shorter length in a front-rear direction of nose portion module 34 and a smaller height of nose portion module 34 .
- the cooling fan in cooling module 33 can electrically or hydraulically be driven independently of engine 32 by an electric motor, a hydraulic motor, or the like.
- a fan speed is variable by means of hydraulic drive.
- Cooling fluid conduits 32 c, 32 d are connected to an inlet port 33 b and an outlet port 33 e of cooling module 33 .
- air taken into the engine is cooled.
- conduits 32 a, 32 b are connected to an inlet port 33 c and an outlet port (not shown) of cooling module 33 .
- engine cooling water is cooled.
- An additional conduit (not shown) is connected to an inlet port 33 a and an outlet port 33 d of cooling module 33 .
- cooled hydraulic oil is supplied to a hydraulic circuit of a vehicle.
- Cooling module 33 is arranged in the rear of cab 1 , between a rear end portion of hydraulic oil tank module 35 and a rear end portion of fuel tank module 36 . This construction provides excellent visibility in the rear of bulldozer 30 , because an operator can visually recognize an area above cooling module 33 , between hydraulic oil tank module 35 and fuel tank module 36 .
- the pair of track frame modules 37 is arranged on left and right sides of vehicle frame 31 , respectively.
- Dozing blade 38 is arranged in the front relative to the front end of vehicle frame 31 .
- cab 1 for work vehicle in the present embodiment mainly has a floor frame 2 , a plurality of pillars 3 , 4 , 5 , a beam member 6 , a roof portion 7 , and an air-conditioning apparatus 15 (hereinafter denoted as an air-conditioner).
- Floor frame 2 is arranged at a bottom portion of cab 1 .
- This floor frame 2 is constituted of an upper floor board 11 and a lower floor board 12 arranged at a distance from each other.
- Upper floor board 11 and lower floor board 12 have a double-walled floor board structure in a hollow box shape. With this structure, noise introduced into cab 1 from below the floor board is reduced.
- the plurality of pillars 3 , 4 , 5 are arranged in a side portion of cab 1 and erected on floor frame 2 . Each pillar 3 , 4 , 5 is arranged such that its longitudinal direction extends in a vertical direction.
- the plurality of pillars 3 , 4 , 5 include a pair of center pillars 3 on the left and right, a pair of front pillars 4 on the left and right, and a pair of rear pillars 5 on the left and right.
- Front pillar 4 , center pillar 3 , and rear pillar 5 are arranged sequentially in this order from the front to the rear of cab 1 .
- Roof portion 7 is arranged in an upper portion of cab 1 and supported against floor frame 2 by the plurality of pillars 3 , 4 , 5 .
- Beam member 6 is connected to each of upper end portions of the pair of center pillars 3 on the left and right and connected to roof portion 7 .
- a space surrounded by floor frame 2 , the plurality of pillars 3 , 4 , 5 , and roof portion 7 is defined as an indoor space 10 in cab 1 .
- Air-conditioner 15 is arranged at a lower front end of this indoor space 10 . As this air-conditioner blows air, an air pressure in indoor space 10 in cab 1 (internal pressure) can be made higher than an air pressure in an outdoor space (external pressure) outside indoor space 10 (pressurized).
- an attachment portion 8 at an operator's seat on which an operator sits is provided.
- an attachment portion 9 for attaching an operating lever, a wire harness, and the like is arranged.
- a recess 9 a for attaching an operating lever 16 is provided at attachment portion 9 on the right when viewed from an operator at such a position that he/she takes a seat.
- a recess 9 b for attaching the wire harness is provided at attachment portion 9 on the left when viewed from the operator.
- FIG. 5 shows a construction of the upper portion of the cab.
- FIG. 6 shows in a perspective view, a construction of a lower portion of the cab.
- FIG. 7 is a top plan view of the construction shown in FIG. 6 .
- front pillar 4 , center pillar 3 , and rear pillar 5 may have hollow spaces 4 a, 3 a, and 5 a, respectively.
- a first opening for connecting the hollow space to the outdoor space and a second opening for connecting the hollow space to indoor space 10 are formed.
- a first opening 3 c for connecting hollow space 3 a to the outdoor space is formed and a second opening 3 b for connecting hollow space 3 a to indoor space 10 is formed.
- This first opening 3 c is a lower end opening of center pillar 3 and second opening 3 b is an upper end opening of center pillar 3 and an indoor-side opening.
- FIG. 8 is an enlarged view showing a portion around an upper end portion of center pillar 3 .
- beam member 6 is connected to an upper end side portion of center pillar 3 .
- upper end opening 3 b of center pillar 3 is not closed by beam member 6 . Therefore, a gap through which hollow space 3 a in center pillar 3 communicates with indoor space 10 can be formed between upper end opening 3 b of the center pillar, beam member 6 , and roof portion 7 .
- a lower end of center pillar 3 is covered with lower floor board 12 of floor frame 2 .
- a through hole 12 a is formed in this lower floor board 12 .
- This through hole 12 a is formed directly under hollow space 3 a in center pillar 3 to thereby connect that hollow space 3 a to the outdoor space of cab 1 .
- through hole 12 a forms an outdoor-side opening which opens into the outdoor space
- lower end opening 3 c is indirectly connected to the outdoor space via through hole 12 a .
- This lower end opening 3 c may be connected to the outdoor space by directly opening into the outdoor space.
- air in indoor space 10 in cab 1 can reach lower end opening 3 c through hollow space 3 a from upper end opening 3 b of center pillar 3 as shown with a bold arrow in FIG. 3 and it can be exhausted to the outdoor space of cab 1 through through hole 12 a in lower floor board 12 .
- cab 1 may be constructed such that air in indoor space 10 in cab 1 can be exhausted to the outdoor space through a hollow space in a cab structure member other than the plurality of pillars 3 , 4 , 5 (such as attachment portion 9 ).
- FIG. 9 is a cross-sectional view along the line IX-IX in FIG. 7 .
- hollow spaces 22 a, 22 b partitioned off indoor space 10 are formed in attachment portion 9 so as to extend in the front-rear direction of cab 1
- hollow space 22 b is formed in attachment portion 9 so as to extend in the vertical direction of cab 1 .
- These hollow space 22 a and hollow space 22 b are connected to each other.
- FIG. 12 shows an exhaust path on the right in the cab.
- a notch 21 a for passing a wire or the like for feeding power to the operating lever is formed.
- hollow spaces 22 a, 22 b in attachment portion 9 on the right are connected to indoor space 10 in cab 1 .
- FIG. 11 shows a cross-section along the line XI-XI in FIG. 7 .
- a lower end of hollow space 22 b in attachment portion 9 on the right is covered with lower floor board 12 of floor frame 2 .
- a through hole 12 b is formed in this lower floor board 12 .
- This through hole 12 b is formed directly under hollow space 22 b and it connects that hollow space 22 b to the outdoor space of cab 1 .
- air in indoor space 10 in cab 1 can reach the lower end of hollow space 22 b through hollow spaces 22 a, 22 b from notch 21 a of recess 9 a of attachment portion 9 on the right and it can be exhausted to the outdoor space of cab 1 through through hole 12 b in lower floor board 12 , as shown with a bold arrow in FIG. 12 .
- a notch 3 d is formed in a lower end portion of center pillar 3 .
- hollow space 3 a in center pillar 3 and hollow space 22 b in attachment portion 9 on the right are connected to each other.
- hollow space 22 b is constructed to be connected to the outdoor space through lower end opening 3 c of center pillar 3 . Therefore, air which has reached hollow space 22 b through notch 21 a of recess 9 a can also be exhausted to the outdoor space from lower end opening 3 c and through hole 12 a through notch 3 d and hollow space 3 a in center pillar 3 .
- hollow spaces 24 a, 24 b partitioned off indoor space 10 are formed in attachment portion 9 so as to extend in the front-rear direction of cab 1 and hollow space 24 b is formed in attachment portion 9 so as to extend in the vertical direction of cab 1 .
- hollow space 24 a and hollow space 24 b are connected to each other.
- FIG. 13 shows an exhaust path on the left in the cab.
- a notch 23 a for passing the wire harness or the like is formed in a wall portion 23 of recess 9 b formed in attachment portion 9 on the left.
- a notch 23 a for passing the wire harness or the like is formed in a wall portion 23 of recess 9 b formed in attachment portion 9 on the left.
- hollow spaces 24 a, 24 b in attachment portion 9 on the left are connected to indoor space 10 in cab 1 .
- a lower end of hollow space 24 b in attachment portion 9 on the left is covered with lower floor board 12 of floor frame 2 .
- Through hole 12 b is formed in this lower floor board 12 .
- This through hole 12 b is formed directly under hollow space 24 b, to thereby connect that hollow space 24 b to the outdoor space of cab 1 .
- air in indoor space 10 in cab 1 can reach the lower end of hollow space 24 b through hollow spaces 24 a, 24 b from notch 23 a of recess 9 b of attachment portion 9 on the left and it can be exhausted to the outdoor space of cab 1 through through hole 12 b of lower floor board 12 , as shown with a bold arrow in FIG. 13 .
- notch 3 d is formed in the lower end portion of center pillar 3 .
- hollow space 3 a in center pillar 3 and hollow space 24 b in attachment portion 9 on the left are connected to each other.
- hollow space 24 b is constructed to be connected to the outdoor space through lower end opening 3 c of center pillar 3 . Therefore, air which has reached hollow space 24 b through notch 23 a of recess 9 b can also be exhausted to the outdoor space from lower end opening 3 c and through hole 12 a through notch 3 d and hollow space 3 a in center pillar 3 .
- a hollow space (a third hollow space) 2 a partitioned off indoor space 10 is formed between upper floor board 11 and lower floor board 12 constituting the double-walled floor board structure of floor frame 2 .
- FIG. 14 is a cross-sectional view along the line XIV-XIV in FIG. 9 .
- a through hole 12 c is formed in lower floor board 12 so as to be located directly under this hollow space 2 a.
- This through hole 12 c connects hollow space 2 a to the outdoor space of cab 1 .
- a notch 3 e is formed in the lower end portion of center pillar 3 .
- This notch 3 e connects hollow space 3 a in center pillar 3 and hollow space 2 a in floor frame 2 to each other. Therefore, hollow space 2 a in floor frame 2 is constructed to be connected to the outdoor space through notch 3 e and hollow space 3 a in center pillar 3 and further through lower end opening 3 c and through hole 12 a.
- each of air which has reached hollow space 3 a in center pillar 3 from indoor space 10 and air which has reached hollow spaces 22 b, 24 b in attachment portion 9 can also be exhausted to the outdoor space from through hole 12 c through notch 3 e.
- FIG. 15 is a top plan view of a work vehicle schematically showing flow of air in the vehicle frame.
- cab 1 has projection portions 1 a , 1 b projecting outward from vehicle frame 31 in a top plan view, and each of through holes 12 a, 12 b, 12 c opens in a lower surface of projection portion 1 a , 1 b.
- a portion including a portion where lower end portion 3 c of center pillar 3 comes in contact in lower floor board 12 of floor frame 2 projects outward from vehicle frame 31 in a top plan view.
- the plurality of through holes 12 a, 12 b, 12 c communicating with hollow space 3 a in that center pillar 3 open in the lower surface of the portion projecting outward from that vehicle frame 31 .
- each of the plurality of through holes 12 a, 12 b, 12 c forms an outdoor-side opening which opens in the lower surface of each of projection portions 1 a, 1 b.
- air in indoor space 10 in cab 1 can be taken into hollow space 3 a through upper end opening 3 b of center pillar 3 and can be exhausted to the outdoor space through through hole 12 a communicating with lower end opening 3 c.
- a differential pressure between an internal pressure and an external pressure in cab 1 exceeds 200 Pa, an operator in the cab is likely to feel uncomfortable.
- a differential pressure between an internal pressure and an external pressure in cab 1 can be suppressed to be lower than 200 Pa and thus an environment in the cab comfortable for the operator can be realized.
- lower end opening 3 c for connection to the outdoor space and upper end opening 3 b for connection to indoor space 10 are arranged at a prescribed distance from each other in the longitudinal direction of center pillar 3 . Therefore, penetration of dust, water, or the like into indoor space 10 from the outdoor space can be prevented.
- upper end opening 3 b is provided at the upper end located at one end in the longitudinal direction of center pillar 3 and lower end opening 3 c is provided at the lower end located at the other end thereof, higher strength can be obtained than in the case where an opening is provided in a side portion of center pillar 3 .
- roof portion 7 is located to cover an extension in the longitudinal direction of center pillar 3 . Therefore, a path for air which enters hollow space 3 a in center pillar 3 from indoor space 10 is bent around upper end opening 3 b, as shown with a bold arrow. Therefore, even though dust, water, or the like is introduced into hollow space 3 a in center pillar 3 through through holes 12 a, 12 b , 12 c, dust, water, or the like cannot reach indoor space 10 unless it moves up through hollow space 3 a and its path is bent around upper end opening 3 b. Thus, penetration of dust, water, or the like into indoor space 10 can more effectively be prevented.
- both of an opening 3 g 1 communicating with indoor space 10 and an opening 3 g 2 communicating with the outdoor space may be provided in a side portion of center pillar 3 .
- opening 3 g 1 and opening 3 g 2 are preferably arranged such that opening 3 g 2 is not reached from indoor space 10 through opening 3 g 1 in a straight path shown with an arrow in the figure.
- opening 3 g 1 and opening 3 g 2 are preferably arranged at a distance from each other by a prescribed distance L1 in the longitudinal direction, which is greater than a distance L2 with which opening 3 g 1 and opening 3 g 2 can be connected to each other through a straight line in a path for air.
- through holes 12 a, 12 b, 12 c for connection to the outdoor space open downward in the lower surface of cab 1 . Therefore, as compared with the case where through holes 12 a, 12 b, 12 c open upward or sideward to the outdoor space, dust, water, or the like is less likely to enter indoor space 10 through through holes 12 a, 12 b, 12 c.
- air can also be exhausted to the outdoor space from indoor space 10 in cab 1 through hollow spaces 22 a, 22 b, 24 a, 24 b in a cab structure member other than the plurality of pillars 3 , 4 , 5 (such as attachment portion 9 ). Therefore, air can more efficiently be exhausted.
- hollow spaces 22 a, 22 b, 24 a, 24 b in attachment portion 9 and hollow space 3 a in center pillar 3 are all connected to the outdoor space through through hole 12 a and they share through hole 12 a connected to the outdoor space. Therefore, it is not necessary to separately provide through hole 12 a in hollow spaces 22 a, 22 b, 24 a, 24 b in attachment portion 9 and in hollow space 3 a in center pillar 3 . Therefore, the number of through holes 12 a can be decreased and high strength of cab 1 can be maintained.
- hollow space 2 a in floor frame 2 is constructed to be connected to the outdoor space through through hole 12 a.
- air can be exhausted to the outdoor space also by making use of hollow space 2 a in the double-walled floor structure of floor frame 2 .
- bulldozer 30 in the present embodiment is what is called a slant nose bulldozer, operator's front visibility is good. Further, as shown in FIG. 15 , since through holes 12 a, 12 b, 12 c open in the lower surface of projection portion 1 a, lb of cab 1 projecting outward from vehicle frame 31 , dust particle or the like is prevented from entering indoor space 10 in cab 1 through through holes 12 a, 12 b, 12 c, which will be described below.
- cooling module 33 has been removed from the engine compartment.
- cooling module 33 is moved to somewhere in bulldozer 30 , which is not between a point of view of the operator in cab 1 and dozing blade 38 , so that cooling module 33 cannot impair visibility of dozing blade 38 .
- cooling module 33 is arranged in the rear of cab 1 . Since cooling module 33 is not in the engine compartment, the engine compartment can be reduced in size so that the engine can be moved to the front. By reducing the size of the engine compartment and moving engine 32 to the front, cab 1 can be moved to the front. Therefore, by providing the operator of this bulldozer 30 with front visibility of a wider angle, operator's visibility in the front of bulldozer 30 can be improved.
- nose portion module 34 covering the engine compartment can further be reduced in size.
- a volume of nose portion module 34 can be decreased.
- a height of the front end of nose portion module 34 is preferably decreased, because this construction can remarkably improve operator's visibility in the front of bulldozer 30 without impairing operator's visibility in the rear of bulldozer 30 .
- nose portion module 34 is inclined downward from the rear side toward the front side of bulldozer 30 .
- an upper central portion of dozing blade 38 is within the operator's view.
- a lowest sight line 40 from an operator's point of view in bulldozer 30 in the present embodiment passes above a top portion 34 a of nose portion module 34 , so that the operator can visually recognize the upper central portion of dozing blade 38 .
- the operator of bulldozer 30 can monitor upheaval or lifting of any material to the above of the upper central portion of dozing blade 38 during operation of the bulldozer.
- sight line 40 in the present embodiment visibility can be improved by 10 degrees to 30 degrees or more and preferably by approximately 23 degrees as shown with an angle ⁇ in FIG. 1 .
- cooling module 33 by removing cooling module 33 from the engine compartment and arranging cooling module 33 at the rear end of vehicle frame 31 as above, operator's front visibility can be improved. In this case, however, suction draft caused by the fan included in cooling module 33 causes flow of cooling air in vehicle frame 31 , from the front end toward the rear end of vehicle frame 31 as shown with an arrow in FIG. 15 .
- indoor space 10 in cab 1 is suctioned and exhausted to the outdoor space through through holes 12 a to 12 c due to the flow of the cooling air above while air-conditioner 15 remains stopped.
- indoor space 10 in cab 1 is in a negative pressure state and dust or the like may enter indoor space 10 in cab 1 .
- FIG. 18 Although a case where a single through hole 12 a is located directly under hollow space 3 a in center pillar 3 as shown in FIG. 3 and the like has been described in the present embodiment, two or more through holes 12 a located directly under hollow space 3 a in center pillar 3 may be provided as shown in FIG. 18 .
- stress can be prevented from concentrating on one through hole 12 a and each through hole 12 a can be reduced in size, large dust particle can also be prevented from entering indoor space 10 in cab 1 .
- an opening of a pillar for connecting the indoor space and the hollow space in the pillar to each other is provided at the upper end of the pillar as shown in FIG. 8 and the like in the present embodiment, it may be provided in a side surface of the pillar in contact with the indoor space.
- a bulldozer has been described as a work vehicle in the present embodiment, the work vehicle according to the present invention is not limited to a bulldozer, and other work vehicles such as a wheel loader may be applicable.
Abstract
Description
- The present invention relates to a cab for work vehicle and a work vehicle.
- In order to prevent penetration of dust, water, or the like, an air pressure in an operator's compartment (a cab) (an internal pressure) of such a work vehicle as a bulldozer has been made higher than an air pressure outside the cab (an external pressure) by blowing air from an air-conditioner. A technique for thus preventing penetration of dust particle or noise from the outside by improving hermeticity in the cab is disclosed, for example, in Japanese Patent Laying-Open No. 2001-81811 (PTL 1).
- In Japanese Patent Laying-Open No. 2001-81811, a cab is formed by fitting a floor frame to a cab main body having an opening in a bottom portion and a gap between the cab main body and the floor frame is sealed. Here, a sealing member is either interposed between upper and lower joint surfaces of a mount portion on a cab main body side and the floor frame or arranged between an outer peripheral portion of the floor frame and an inner peripheral portion on the cab main body side opposed thereto.
- As a result of improved performance of an air-conditioner on one hand and higher hermeticity in the cab on the other hand, however, a differential pressure between an internal pressure and an external pressure may exceed a threshold value beyond which an operator in the cab feels uncomfortable.
- The present invention was made in view of the problem above, and an object thereof is to provide a cab for work vehicle and a work vehicle capable of preventing dust, water, or the like from entering the cab and realizing an environment in the cab comfortable for an operator.
- A cab for work vehicle according to the present invention includes a floor frame and a plurality of pillars. The plurality of pillars are erected on the floor frame. At least one pillar of the plurality of pillars has a pipe structure having a first hollow space. In the at least one pillar, a first opening for connecting the first hollow space to an outdoor space outside an indoor space surrounded by the plurality of pillars and a second opening for connecting the first hollow space to the indoor space are formed. The first opening and the second opening are arranged at a prescribed distance from each other in a longitudinal direction of the pillar.
- According to the cab for work vehicle in the present invention, air in the indoor space in the cab can be exhausted to the outdoor space through the first hollow space in the pillar. Therefore, a differential pressure between an internal pressure and an external pressure in the cab can be suppressed to be lower than a threshold value and an environment in the cab comfortable for an operator can be realized.
- In addition, the first opening for connection to the outdoor space and the second opening for connection to the indoor space are arranged at a prescribed distance from each other in the longitudinal direction of the pillar. Therefore, penetration of dust, water, or the like from the outdoor space into the indoor space can be prevented.
- It is noted that the first opening may be connected to the outdoor space by directly opening into the outdoor space, or it may be connected to the outdoor space indirectly through other spaces, other holes, or the like. The first opening should only be connected to the outdoor space such that the function and effect above can be achieved.
- In the cab for work vehicle above, the plurality of pillars include a front pillar, a center pillar, and a rear pillar sequentially arranged from front to rear of the cab. The center pillar has the pipe structure having the first hollow space and has an upper end opening through which the first hollow space opens at an upper end of the center pillar and a lower end opening through which the first hollow space opens at a lower end of the center pillar. The lower end opening is the first opening and the upper end opening is the second opening.
- By thus providing the first opening as the lower end opening of the center pillar and providing the second opening as the upper end opening of the center pillar, the first opening and the second opening can be arranged at a prescribed distance from each other in the longitudinal direction of the center pillar. Thus, penetration of dust, water, or the like from the outdoor space into the indoor space can be prevented. In addition, the first opening for connection to the outdoor space is the lower end opening of the center pillar and it opens downward. Therefore, as compared with the case where an opening opens upward into the outdoor space, dust, water, or the like is less likely to enter the indoor space through the first opening.
- The cab for work vehicle above further includes a cab structure member other than the plurality of pillars. The cab structure member has a second hollow space partitioned off the indoor space and a third opening for connecting the second hollow space to the indoor space. The second hollow space is constructed to be connected to the outdoor space through the first opening.
- Thus, since air can be exhausted also from the indoor space of the cab to the outdoor space through the second hollow space in the cab structure member other than the pillar, air can more efficiently be exhausted. In addition, since the second hollow space in the cab structure member and the first hollow space in the pillar are both connected to the outdoor space through the first opening and they share the opening connected to the outdoor space, it is not necessary to separately provide an opening in the first and second hollow spaces. Therefore, the number of openings can be reduced and high strength of the cab can be maintained.
- In the cab for work vehicle above, the floor frame has a double-walled floor board structure constituted of a lower floor board and an upper floor board arranged at a distance from each other, and a third hollow space lying between the lower floor board and the upper floor board is constructed to be connected to the outdoor space through the first opening.
- Thus, air can be exhausted to the outdoor space also by making use of the hollow space in the double-walled floor structure.
- A work vehicle according to the present invention includes a vehicle frame, any cab for work vehicle described above, an engine, and an engine cooling module. The vehicle frame has a front end and a rear end. The cab for work vehicle is mounted on the vehicle frame, between the front end and the rear end of the vehicle frame. The engine is attached to the vehicle frame on a side of the front end relative to the cab for work vehicle. The engine cooling module serves for cooling the engine and it is attached to the vehicle frame at the rear end. The cab for work vehicle has a projection portion projecting outward from the vehicle frame in a top plan view and an outdoor-side opening communicating with the first opening in a lower surface of the projection portion.
- The work vehicle according to the present invention has the outdoor-side opening communicating with the first opening in the lower surface of the projection portion projecting outward from the vehicle frame. Therefore, air in the indoor space in the cab is prevented from being suctioned and exhausted to the outdoor space by induced draft caused by a fan in the cooling module. Thus, an air-conditioner can provide an appropriate pressure to the indoor space in the cab. Therefore, since dust particle or the like can be prevented from entering the indoor space in the cab through the outdoor-side opening, a desired differential pressure can be ensured in the indoor space in the cab and comfort for an operator is improved.
- In the work vehicle above, the outdoor-side opening includes a plurality of openings separate from one another.
- Thus, since stress can be prevented from concentrating on one opening, the total opening area of the plurality of openings can be made equal to an opening area of one opening, and a size of each one opening can be made smaller, large dust particle can also be prevented from entering the indoor space in the cab.
- As described above, according to the present invention, dust, water, or the like can be prevented from entering a cab and an environment in the cab comfortable for an operator can be realized.
-
FIG. 1 is a side view schematically showing a construction of a work vehicle in one embodiment of the present invention. -
FIG. 2 is an exploded perspective view schematically showing the construction of the work vehicle in one embodiment of the present invention. -
FIG. 3 is a perspective view schematically showing from below a construction of a cab for work vehicle in one embodiment of the present invention. -
FIG. 4 is a perspective view schematically showing from above the construction of the cab for work vehicle in one embodiment of the present invention. -
FIG. 5 is a perspective view schematically showing from below a construction of an upper portion of the cab for work vehicle in one embodiment of the present invention. -
FIG. 6 is a perspective view schematically showing from above a construction of a lower portion of the cab for work vehicle in one embodiment of the present invention. -
FIG. 7 is a diagram of the cab for work vehicle in one embodiment of the present invention when viewed in a direction of an arrow VII inFIG. 6 . -
FIG. 8 is a schematic perspective view showing a portion around an upper end portion of a center pillar of the cab for work vehicle in one embodiment of the present invention. -
FIG. 9 is a schematic cross-sectional view along the line IX-IX inFIG. 7 . -
FIG. 10 is a schematic cross-sectional view along the line X-X inFIG. 7 . -
FIG. 11 is a schematic cross-sectional view along the line XI-XI inFIG. 7 . -
FIG. 12 is a schematic perspective view showing an exhaust path in each of a pillar and a cab structure member (on the right side). -
FIG. 13 is a schematic perspective view showing an exhaust path in each of a pillar and a cab structure member (on the left side). -
FIG. 14 is a schematic cross-sectional view along the line XIV-XIV inFIG. 9 . -
FIG. 15 is a top plan view for illustrating flow of air in a vehicle frame of the work vehicle in one embodiment of the present invention. -
FIG. 16 is a perspective view from below, for illustrating a cab of the work vehicle in one embodiment of the present invention having a portion projecting from the vehicle frame. -
FIG. 17 is a cross-sectional view for illustrating an arrangement position of an opening which opens into an indoor space and an opening which opens into an outdoor space, both of which are provided in the pillar. -
FIG. 18 is an enlarged view of a portion corresponding to a region R inFIG. 3 , showing a construction where a plurality of through holes are provided directly under a hollow space in the center pillar. - An embodiment of the present invention will be described hereinafter with reference to the drawings.
- Referring to
FIGS. 1 and 2 , abulldozer 30 which is a work vehicle in the present embodiment mainly has acab 1, avehicle frame 31, anengine 32, anengine cooling module 33, anose portion module 34, a hydraulicoil tank module 35, afuel tank module 36, a pair oftrack frame modules 37, and adozing blade 38.Cab 1 is a shelter for accommodating an operator's platform. -
Vehicle frame 31 has a front end and a rear end.Cab 1 is mounted onvehicle frame 31, between the front end and the rear end ofvehicle frame 31. An operator's seat, an instrument panel, a steering mechanism, and the like are attached to thiscab 1.Engine 32 is attached tovehicle frame 31 on a front end side ofvehicle frame 31 relative tocab 1. -
Nose portion module 34 coversengine 32 and an engine compartment.Cab 1 is arranged in the rear ofengine 32 and the engine compartment covered withnose portion module 34. - Hydraulic
oil tank module 35 serves to store hydraulic oil for actuating a work implement such asdozing blade 38 ofbulldozer 30 and it is arranged on one side ofcab 1.Fuel tank module 36 serves to store fuel to be supplied toengine 32 and it is arranged on the other side ofcab 1. -
Cooling module 33 serves to coolengine 32 and the like and it is attached tovehicle frame 31 at the rear end ofvehicle frame 31.Cooling module 33 can include a radiator body portion including a charged air cooling (CAC) apparatus, a hydraulic oil cooling apparatus, an engine cooling water cooling apparatus, and a cooling fan. The bulldozer in whichcooling module 33 is arranged at the rear end ofvehicle frame 31 as described above is better in front viewability as a vehicle than a general bulldozer in which a cooling module is arranged on a front side of a vehicle frame. This is because a bulldozer with such arrangement can have a shorter length in a front-rear direction ofnose portion module 34 and a smaller height ofnose portion module 34. - The cooling fan in
cooling module 33 can electrically or hydraulically be driven independently ofengine 32 by an electric motor, a hydraulic motor, or the like. In a suitable construction, a fan speed is variable by means of hydraulic drive. - Cooling
fluid conduits inlet port 33 b and anoutlet port 33 e of coolingmodule 33. Thus, air taken into the engine is cooled. Similarly,conduits inlet port 33 c and an outlet port (not shown) ofcooling module 33. Thus, engine cooling water is cooled. An additional conduit (not shown) is connected to aninlet port 33 a and anoutlet port 33 d of coolingmodule 33. Thus, cooled hydraulic oil is supplied to a hydraulic circuit of a vehicle. -
Cooling module 33 is arranged in the rear ofcab 1, between a rear end portion of hydraulicoil tank module 35 and a rear end portion offuel tank module 36. This construction provides excellent visibility in the rear ofbulldozer 30, because an operator can visually recognize an area above coolingmodule 33, between hydraulicoil tank module 35 andfuel tank module 36. - The pair of
track frame modules 37 is arranged on left and right sides ofvehicle frame 31, respectively. Dozingblade 38 is arranged in the front relative to the front end ofvehicle frame 31. - Referring to
FIGS. 3 and 4 ,cab 1 for work vehicle in the present embodiment mainly has afloor frame 2, a plurality ofpillars beam member 6, aroof portion 7, and an air-conditioning apparatus 15 (hereinafter denoted as an air-conditioner). -
Floor frame 2 is arranged at a bottom portion ofcab 1. Thisfloor frame 2 is constituted of anupper floor board 11 and alower floor board 12 arranged at a distance from each other.Upper floor board 11 andlower floor board 12 have a double-walled floor board structure in a hollow box shape. With this structure, noise introduced intocab 1 from below the floor board is reduced. - The plurality of
pillars cab 1 and erected onfloor frame 2. Eachpillar pillars center pillars 3 on the left and right, a pair offront pillars 4 on the left and right, and a pair ofrear pillars 5 on the left and right.Front pillar 4,center pillar 3, andrear pillar 5 are arranged sequentially in this order from the front to the rear ofcab 1. -
Roof portion 7 is arranged in an upper portion ofcab 1 and supported againstfloor frame 2 by the plurality ofpillars Beam member 6 is connected to each of upper end portions of the pair ofcenter pillars 3 on the left and right and connected toroof portion 7. - A space surrounded by
floor frame 2, the plurality ofpillars roof portion 7 is defined as anindoor space 10 incab 1. Air-conditioner 15 is arranged at a lower front end of thisindoor space 10. As this air-conditioner blows air, an air pressure inindoor space 10 in cab 1 (internal pressure) can be made higher than an air pressure in an outdoor space (external pressure) outside indoor space 10 (pressurized). - In
indoor space 10, anattachment portion 8 at an operator's seat on which an operator sits is provided. On each of left and right sides of thisattachment portion 8 at the operator's seat, anattachment portion 9 for attaching an operating lever, a wire harness, and the like is arranged. Atattachment portion 9 on the right when viewed from an operator at such a position that he/she takes a seat, for example, arecess 9 a for attaching an operatinglever 16 is provided. In addition, atattachment portion 9 on the left when viewed from the operator, for example, arecess 9 b for attaching the wire harness is provided. - In this
cab 1, at least one pillar of the plurality ofpillars FIG. 5 shows a construction of the upper portion of the cab.FIG. 6 shows in a perspective view, a construction of a lower portion of the cab.FIG. 7 is a top plan view of the construction shown inFIG. 6 . Referring to theseFIGS. 5 to 7 ,front pillar 4,center pillar 3, andrear pillar 5 may havehollow spaces - In at least one pillar, a first opening for connecting the hollow space to the outdoor space and a second opening for connecting the hollow space to
indoor space 10 are formed. Specifically, as shown inFIG. 3 , for example incenter pillar 3, afirst opening 3 c for connectinghollow space 3 a to the outdoor space is formed and asecond opening 3 b for connectinghollow space 3 a toindoor space 10 is formed. Thisfirst opening 3 c is a lower end opening ofcenter pillar 3 andsecond opening 3 b is an upper end opening ofcenter pillar 3 and an indoor-side opening. -
FIG. 8 is an enlarged view showing a portion around an upper end portion ofcenter pillar 3. Referring to thisFIG. 8 ,beam member 6 is connected to an upper end side portion ofcenter pillar 3. Thus,upper end opening 3 b ofcenter pillar 3 is not closed bybeam member 6. Therefore, a gap through whichhollow space 3 a incenter pillar 3 communicates withindoor space 10 can be formed betweenupper end opening 3 b of the center pillar,beam member 6, androof portion 7. - Referring to
FIG. 3 , a lower end ofcenter pillar 3 is covered withlower floor board 12 offloor frame 2. In thislower floor board 12, a throughhole 12 a is formed. This throughhole 12 a is formed directly underhollow space 3 a incenter pillar 3 to thereby connect thathollow space 3 a to the outdoor space ofcab 1. Namely, throughhole 12 a forms an outdoor-side opening which opens into the outdoor space, andlower end opening 3 c is indirectly connected to the outdoor space via throughhole 12 a. Thislower end opening 3 c may be connected to the outdoor space by directly opening into the outdoor space. - Thus, air in
indoor space 10 incab 1 can reachlower end opening 3 c throughhollow space 3 a fromupper end opening 3 b ofcenter pillar 3 as shown with a bold arrow inFIG. 3 and it can be exhausted to the outdoor space ofcab 1 through throughhole 12 a inlower floor board 12. - In addition,
cab 1 may be constructed such that air inindoor space 10 incab 1 can be exhausted to the outdoor space through a hollow space in a cab structure member other than the plurality ofpillars -
FIG. 9 is a cross-sectional view along the line IX-IX inFIG. 7 . Referring toFIGS. 7 and 9 , inattachment portion 9 on the right when viewed from an operator at a position where he/she takes a seat,hollow spaces indoor space 10 are formed.Hollow space 22 a is formed inattachment portion 9 so as to extend in the front-rear direction ofcab 1, andhollow space 22 b is formed inattachment portion 9 so as to extend in the vertical direction ofcab 1. Thesehollow space 22 a andhollow space 22 b are connected to each other. -
FIG. 12 shows an exhaust path on the right in the cab. Referring to thisFIG. 12 , in awall portion 21 ofrecess 9 a formed inattachment portion 9 on the right, anotch 21 a for passing a wire or the like for feeding power to the operating lever is formed. Through thisnotch 21 a,hollow spaces attachment portion 9 on the right are connected toindoor space 10 incab 1. -
FIG. 11 shows a cross-section along the line XI-XI inFIG. 7 . Referring to theseFIGS. 11 and 12 , a lower end ofhollow space 22 b inattachment portion 9 on the right is covered withlower floor board 12 offloor frame 2. A throughhole 12 b is formed in thislower floor board 12. This throughhole 12 b is formed directly underhollow space 22 b and it connects thathollow space 22 b to the outdoor space ofcab 1. - Thus, air in
indoor space 10 incab 1 can reach the lower end ofhollow space 22 b throughhollow spaces notch 21 a ofrecess 9 a ofattachment portion 9 on the right and it can be exhausted to the outdoor space ofcab 1 through throughhole 12 b inlower floor board 12, as shown with a bold arrow inFIG. 12 . - As shown in
FIG. 12 , anotch 3 d is formed in a lower end portion ofcenter pillar 3. Through thisnotch 3 d,hollow space 3 a incenter pillar 3 andhollow space 22 b inattachment portion 9 on the right are connected to each other. Thus,hollow space 22 b is constructed to be connected to the outdoor space throughlower end opening 3 c ofcenter pillar 3. Therefore, air which has reachedhollow space 22 b throughnotch 21 a ofrecess 9 a can also be exhausted to the outdoor space fromlower end opening 3 c and throughhole 12 a throughnotch 3 d andhollow space 3 a incenter pillar 3. - In addition, referring to
FIGS. 7 and 10 , inattachment portion 9 on the left when viewed from an operator at a position where he/she takes a seat,hollow spaces indoor space 10 are formed.Hollow space 24 a is formed inattachment portion 9 so as to extend in the front-rear direction ofcab 1 andhollow space 24 b is formed inattachment portion 9 so as to extend in the vertical direction ofcab 1. - These
hollow space 24 a andhollow space 24 b are connected to each other. -
FIG. 13 shows an exhaust path on the left in the cab. Referring to thisFIG. 13 , in awall portion 23 ofrecess 9 b formed inattachment portion 9 on the left, anotch 23 a for passing the wire harness or the like is formed. Through thisnotch 23 a,hollow spaces attachment portion 9 on the left are connected toindoor space 10 incab 1. - Referring to
FIGS. 11 and 13 , a lower end ofhollow space 24 b inattachment portion 9 on the left is covered withlower floor board 12 offloor frame 2. Throughhole 12 b is formed in thislower floor board 12. This throughhole 12 b is formed directly underhollow space 24 b, to thereby connect thathollow space 24 b to the outdoor space ofcab 1. - Thus, air in
indoor space 10 incab 1 can reach the lower end ofhollow space 24 b throughhollow spaces notch 23 a ofrecess 9 b ofattachment portion 9 on the left and it can be exhausted to the outdoor space ofcab 1 through throughhole 12 b oflower floor board 12, as shown with a bold arrow inFIG. 13 . - As shown in
FIG. 13 ,notch 3 d is formed in the lower end portion ofcenter pillar 3. Through thisnotch 3 d,hollow space 3 a incenter pillar 3 andhollow space 24 b inattachment portion 9 on the left are connected to each other. Thus,hollow space 24 b is constructed to be connected to the outdoor space throughlower end opening 3 c ofcenter pillar 3. Therefore, air which has reachedhollow space 24 b throughnotch 23 a ofrecess 9 b can also be exhausted to the outdoor space fromlower end opening 3 c and throughhole 12 a throughnotch 3 d andhollow space 3 a incenter pillar 3. - Referring to
FIGS. 9 and 10 , a hollow space (a third hollow space) 2 a partitioned offindoor space 10 is formed betweenupper floor board 11 andlower floor board 12 constituting the double-walled floor board structure offloor frame 2. -
FIG. 14 is a cross-sectional view along the line XIV-XIV inFIG. 9 . Referring to thisFIG. 14 , a throughhole 12 c is formed inlower floor board 12 so as to be located directly under thishollow space 2 a. This throughhole 12 c connectshollow space 2 a to the outdoor space ofcab 1. - In addition, a
notch 3 e is formed in the lower end portion ofcenter pillar 3. Thisnotch 3 e connectshollow space 3 a incenter pillar 3 andhollow space 2 a infloor frame 2 to each other. Therefore,hollow space 2 a infloor frame 2 is constructed to be connected to the outdoor space throughnotch 3 e andhollow space 3 a incenter pillar 3 and further throughlower end opening 3 c and throughhole 12 a. - Moreover, each of air which has reached
hollow space 3 a incenter pillar 3 fromindoor space 10 and air which has reachedhollow spaces attachment portion 9 can also be exhausted to the outdoor space from throughhole 12 c throughnotch 3 e. -
FIG. 15 is a top plan view of a work vehicle schematically showing flow of air in the vehicle frame. Referring to thisFIG. 15 ,cab 1 hasprojection portions vehicle frame 31 in a top plan view, and each of throughholes projection portion - Referring to
FIG. 16 , for example, a portion including a portion wherelower end portion 3 c ofcenter pillar 3 comes in contact inlower floor board 12 offloor frame 2 projects outward fromvehicle frame 31 in a top plan view. Then, the plurality of throughholes hollow space 3 a in thatcenter pillar 3 open in the lower surface of the portion projecting outward from thatvehicle frame 31. Namely, each of the plurality of throughholes projection portions - A function and effect of the present embodiment will now be described.
- Referring to
FIG. 3 , according tocab 1 in the present embodiment, air inindoor space 10 incab 1 can be taken intohollow space 3 a throughupper end opening 3 b ofcenter pillar 3 and can be exhausted to the outdoor space through throughhole 12 a communicating withlower end opening 3 c. In general, when a differential pressure between an internal pressure and an external pressure incab 1 exceeds 200 Pa, an operator in the cab is likely to feel uncomfortable. For the above-described reason, however, a differential pressure between an internal pressure and an external pressure incab 1 can be suppressed to be lower than 200 Pa and thus an environment in the cab comfortable for the operator can be realized. - In addition,
lower end opening 3 c for connection to the outdoor space andupper end opening 3 b for connection toindoor space 10 are arranged at a prescribed distance from each other in the longitudinal direction ofcenter pillar 3. Therefore, penetration of dust, water, or the like intoindoor space 10 from the outdoor space can be prevented. - Moreover, as described above, since
upper end opening 3 b is provided at the upper end located at one end in the longitudinal direction ofcenter pillar 3 andlower end opening 3 c is provided at the lower end located at the other end thereof, higher strength can be obtained than in the case where an opening is provided in a side portion ofcenter pillar 3. - Furthermore, as shown in
FIG. 3 ,roof portion 7 is located to cover an extension in the longitudinal direction ofcenter pillar 3. Therefore, a path for air which entershollow space 3 a incenter pillar 3 fromindoor space 10 is bent aroundupper end opening 3 b, as shown with a bold arrow. Therefore, even though dust, water, or the like is introduced intohollow space 3 a incenter pillar 3 through throughholes indoor space 10 unless it moves up throughhollow space 3 a and its path is bent aroundupper end opening 3 b. Thus, penetration of dust, water, or the like intoindoor space 10 can more effectively be prevented. - As shown in
FIG. 17 , both of an opening 3g 1 communicating withindoor space 10 and an opening 3g 2 communicating with the outdoor space may be provided in a side portion ofcenter pillar 3. In this case, opening 3g 1 and opening 3g 2 are preferably arranged such that opening 3g 2 is not reached fromindoor space 10 through opening 3g 1 in a straight path shown with an arrow in the figure. Namely, opening 3g 1 and opening 3g 2 are preferably arranged at a distance from each other by a prescribed distance L1 in the longitudinal direction, which is greater than a distance L2 with which opening 3g 1 and opening 3g 2 can be connected to each other through a straight line in a path for air. - Thus, even though dust, water, or the like is introduced into
hollow space 3 a incenter pillar 3 through opening 3g 2, dust, water, or the like cannot reachindoor space 10 through opening 3g 1 unless its path is bent. Therefore, penetration of dust, water, or the like intoindoor space 10 can more effectively be prevented. - Moreover, as shown in
FIG. 3 , throughholes cab 1. Therefore, as compared with the case where throughholes indoor space 10 through throughholes - Moreover, as shown in
FIGS. 12 and 13 , air can also be exhausted to the outdoor space fromindoor space 10 incab 1 throughhollow spaces pillars - Furthermore,
hollow spaces attachment portion 9 andhollow space 3 a incenter pillar 3 are all connected to the outdoor space through throughhole 12 a and they share throughhole 12 a connected to the outdoor space. Therefore, it is not necessary to separately provide throughhole 12 a inhollow spaces attachment portion 9 and inhollow space 3 a incenter pillar 3. Therefore, the number of throughholes 12 a can be decreased and high strength ofcab 1 can be maintained. - As shown in
FIG. 14 ,hollow space 2 a infloor frame 2 is constructed to be connected to the outdoor space through throughhole 12 a. Thus, air can be exhausted to the outdoor space also by making use ofhollow space 2 a in the double-walled floor structure offloor frame 2. - In addition, since
bulldozer 30 in the present embodiment is what is called a slant nose bulldozer, operator's front visibility is good. Further, as shown inFIG. 15 , since throughholes projection portion 1 a, lb ofcab 1 projecting outward fromvehicle frame 31, dust particle or the like is prevented from enteringindoor space 10 incab 1 through throughholes - As shown in
FIGS. 1 and 2 , in the present embodiment, coolingmodule 33 has been removed from the engine compartment. For example, coolingmodule 33 is moved to somewhere inbulldozer 30, which is not between a point of view of the operator incab 1 anddozing blade 38, so that coolingmodule 33 cannot impair visibility of dozingblade 38. Preferably, coolingmodule 33 is arranged in the rear ofcab 1. Since coolingmodule 33 is not in the engine compartment, the engine compartment can be reduced in size so that the engine can be moved to the front. By reducing the size of the engine compartment and movingengine 32 to the front,cab 1 can be moved to the front. Therefore, by providing the operator of thisbulldozer 30 with front visibility of a wider angle, operator's visibility in the front ofbulldozer 30 can be improved. - Additionally, by removing
cooling module 33 from the engine compartment,nose portion module 34 covering the engine compartment can further be reduced in size. Thus, a volume ofnose portion module 34 can be decreased. A height of the front end ofnose portion module 34 is preferably decreased, because this construction can remarkably improve operator's visibility in the front ofbulldozer 30 without impairing operator's visibility in the rear ofbulldozer 30. In this suitable embodiment,nose portion module 34 is inclined downward from the rear side toward the front side ofbulldozer 30. Thus, as shown inFIG. 13 , an upper central portion of dozingblade 38 is within the operator's view. - As shown in
FIG. 1 , alowest sight line 40 from an operator's point of view inbulldozer 30 in the present embodiment passes above atop portion 34 a ofnose portion module 34, so that the operator can visually recognize the upper central portion of dozingblade 38. Thus, the operator ofbulldozer 30 can monitor upheaval or lifting of any material to the above of the upper central portion of dozingblade 38 during operation of the bulldozer. - It is noted that, according to
sight line 40 in the present embodiment, visibility can be improved by 10 degrees to 30 degrees or more and preferably by approximately 23 degrees as shown with an angle α inFIG. 1 . - Referring to
FIG. 15 , by removingcooling module 33 from the engine compartment and arrangingcooling module 33 at the rear end ofvehicle frame 31 as above, operator's front visibility can be improved. In this case, however, suction draft caused by the fan included incooling module 33 causes flow of cooling air invehicle frame 31, from the front end toward the rear end ofvehicle frame 31 as shown with an arrow inFIG. 15 . - Therefore, if through
holes 12 a to 12 c ofcab 1 open into an internal space invehicle frame 31 in a top plan view, air inindoor space 10 incab 1 is suctioned and exhausted to the outdoor space through throughholes 12 a to 12 c due to the flow of the cooling air above while air-conditioner 15 remains stopped. Thus,indoor space 10 incab 1 is in a negative pressure state and dust or the like may enterindoor space 10 incab 1. - When
indoor space 10 incab 1 is pressurized by air-conditioner 15, air inindoor space 10 incab 1 is suctioned and exhausted to the outdoor space through throughholes 12 a to 12 c due to the flow of cooling air above, which leads to the possibility that a desired differential pressure cannot be ensured inindoor space 10 incab 1. - In contrast, in the present embodiment, as shown in
FIG. 15 , throughholes projection portion cab 1, which projects outward fromvehicle frame 31 in a top plan view. Therefore, air inindoor space 10 incab 1 is prevented from being suctioned and exhausted to the outdoor space due to suction draft caused by the fan incooling module 33. Thus, an appropriate pressure can be provided by air-conditioner 15 toindoor space 10 incab 1. Therefore, since dust particle or the like can be prevented from enteringindoor space 10 incab 1 through throughholes indoor space 10 incab 1 can be ensured, operator's comfort is improved. - Though a case where a single through
hole 12 a is located directly underhollow space 3 a incenter pillar 3 as shown inFIG. 3 and the like has been described in the present embodiment, two or more throughholes 12 a located directly underhollow space 3 a incenter pillar 3 may be provided as shown inFIG. 18 . Thus, since stress can be prevented from concentrating on one throughhole 12 a and each throughhole 12 a can be reduced in size, large dust particle can also be prevented from enteringindoor space 10 incab 1. - Though a case where through
holes lower floor board 12 as shown inFIG. 14 has been described in the present embodiment, in the case wherehollow space 3 a,hollow spaces hollow space 2 a are connected to one another by providingnotches center pillar 3, only any one of throughholes - Though an opening of a pillar for connecting the indoor space and the hollow space in the pillar to each other is provided at the upper end of the pillar as shown in
FIG. 8 and the like in the present embodiment, it may be provided in a side surface of the pillar in contact with the indoor space. - Furthermore, though a bulldozer has been described as a work vehicle in the present embodiment, the work vehicle according to the present invention is not limited to a bulldozer, and other work vehicles such as a wheel loader may be applicable.
- It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
- 1 cab for work vehicle; 1 a, 1 b projection portion; 2 floor frame; 2 a, 3 a, 4 a, 22 a, 22 b, 24 a, 24 b hollow space; 3 center pillar; 3 b upper end opening; 3 c lower end opening; 3 d, 3 e notch; 3
g 1, 3g 2 opening; 4 front pillar; 5 rear pillar; 6 beam member; 7 roof portion; 8 attachment portion at operator's seat; 9 attachment portion; 9 a, 9 b recess; 10 indoor space; 11 upper floor board; 12 lower floor board; 12 a, 12 b, 12 c through hole; 15 air-conditioner; 21 wall portion; 21 a, 23 a notch; 23 wall portion; 30 bulldozer; 31 vehicle frame; 32 engine; 32 a, 32 b conduit; 32 c, 32 d cooling fluid conduit; 33 engine cooling module; 33 a, 33 b, 33 c inlet port; 33 d, 33 e outlet port; 34 nose portion module; 34 a top portion; 35 hydraulic oil tank module; 36 fuel tank module; 37 track frame module; and 38 dozing blade.
Claims (6)
Priority Applications (1)
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US14/803,526 US9643662B2 (en) | 2012-02-23 | 2015-07-20 | Cab for work vehicle and work vehicle |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2012037376A JP5208290B1 (en) | 2012-02-23 | 2012-02-23 | Work vehicle cab and work vehicle |
JP2012-037376 | 2012-02-23 | ||
PCT/JP2012/065225 WO2013125059A1 (en) | 2012-02-23 | 2012-06-14 | Work vehicle cab and work vehicle |
Related Parent Applications (1)
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PCT/JP2012/065225 A-371-Of-International WO2013125059A1 (en) | 2012-02-23 | 2012-06-14 | Work vehicle cab and work vehicle |
Related Child Applications (1)
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US14/803,526 Continuation US9643662B2 (en) | 2012-02-23 | 2015-07-20 | Cab for work vehicle and work vehicle |
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US20150000996A1 true US20150000996A1 (en) | 2015-01-01 |
US9126643B2 US9126643B2 (en) | 2015-09-08 |
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ID=48713107
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US13/700,003 Active US9126643B2 (en) | 2012-02-23 | 2012-06-14 | Cab for work vehicle and work vehicle |
US14/803,526 Active US9643662B2 (en) | 2012-02-23 | 2015-07-20 | Cab for work vehicle and work vehicle |
Family Applications After (1)
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US14/803,526 Active US9643662B2 (en) | 2012-02-23 | 2015-07-20 | Cab for work vehicle and work vehicle |
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US (2) | US9126643B2 (en) |
JP (1) | JP5208290B1 (en) |
CN (1) | CN103403267B (en) |
WO (1) | WO2013125059A1 (en) |
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US9574325B2 (en) * | 2015-03-16 | 2017-02-21 | Komatsu Ltd. | Work vehicle and cab for work vehicle |
US9708951B2 (en) | 2014-08-25 | 2017-07-18 | Komatsu Ltd. | Reducing agent tank module |
US20190225176A1 (en) * | 2018-01-25 | 2019-07-25 | Kubota Corporation | Cabin-protection structure and tractor |
US10583812B2 (en) | 2017-07-20 | 2020-03-10 | Komatsu Ltd. | Cab of work vehicle and work vehicle |
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US20220105995A1 (en) * | 2019-01-29 | 2022-04-07 | Jiangsu Xcmg Construction Machinery Research Institute Ltd. | Cab frame, cab, and engineering vehicle |
US20220144040A1 (en) * | 2019-03-01 | 2022-05-12 | Yanmar Power Technology Co., Ltd. | Construction machine |
US20220145586A1 (en) * | 2020-11-09 | 2022-05-12 | Deere & Company | Tractor cab fresh air intake |
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Also Published As
Publication number | Publication date |
---|---|
CN103403267A (en) | 2013-11-20 |
US9126643B2 (en) | 2015-09-08 |
WO2013125059A1 (en) | 2013-08-29 |
CN103403267B (en) | 2014-11-05 |
US9643662B2 (en) | 2017-05-09 |
US20150321705A1 (en) | 2015-11-12 |
JP2013174044A (en) | 2013-09-05 |
JP5208290B1 (en) | 2013-06-12 |
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